map -package:containers -package:insert-ordered-containers -package:blaze-html -package:conduit -package:basement -package:pipes -package:bytestring -package:ghc -package:charset -package:Cabal-syntax -package:case-insensitive -package:regex-tdfa -package:incipit-base -package:filepath -package:os-string -package:amazonka-core -package:aeson -package:base-compat package:vector-stream

Map a function over a Stream
Map a monadic function over a Stream
Execute a monadic action for each element of the Stream
Apply monadic function to each element and drop all Nothings